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SUMMARY:Toya Tanaka - Spectroscopy of the muonium hyperfine structure
DTSTART;VALUE=DATE-TIME:20190227T170000Z
DTEND;VALUE=DATE-TIME:20190227T180000Z
DTSTAMP;VALUE=DATE-TIME:20190525T130256Z
UID:indico-event-19645@cern.ch
DESCRIPTION:Muonium is a bound state of a positive muon and an electron. T
his characteristic enables a precise QED calculation of its physical prope
rties\, and the measurement can be performed with high precision because o
f its relatively long lifetime and the parity violation when the muon deca
ys. MuSEUM (Muonium Spectroscopy Experiment Using Microwave) collaboration
aims to measure the muonium hyperfine structure by using the muon beam li
ne of the J-PARC MLF (Materials and Life science Facility). This precise m
easurement will be a stringent test of the bound-state QED. By the muoni
um hyperfine spectroscopy with a high magnetic field\, the muon-proton mag
netic moment ratio and the muon-electron mass ratio can be extracted as by
products [1]\, which the precision are significant to other muon physical
properties. The muon-proton magnetic moment ratio is a parameter to decide
the muon anomalous magnetic moment\, which is known as there is a 3.7 sta
ndard deviation discrepancy between the theoretical precision and the expe
rimental result [2][3]. The precision of the muon-electron mass ratio is t
he dominant uncertainty of the muonium hyperfine structure in theoretical
calculation[4].\nMuSEUM collaboration succeeded to measure the muonium hyp
erfine structure with an extremely low magnetic field. We are now continui
ng this and planning a new measurement with the high magnetic field. In th
is presentation I would like to overview the measurement status and the R&
D for the future high field measurement.\n\nhttps://indico.fnal.gov/event/
19645/
LOCATION:Building 362 room F-108
URL:https://indico.fnal.gov/event/19645/
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